package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     *切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }


        @Before("autoFillPointCut()")
        public void autoFill(JoinPoint joinPoint){
           //获取到当前被拦截的方法上的数据库操作类型
            MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
            AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
            OperationType operationType = autoFill.value();//获得数据库操作类型
            //获取到当前被拦截的方法上的参数实体对象
            Object[] args = joinPoint.getArgs();
            if (args == null || args.length == 0){
                return;
                
            }
            Object entity =args[0];

            //准备赋值的数据
            LocalDateTime now = LocalDateTime.now();
            Long currentId = BaseContext.getCurrentId();
            //根据当前不同的操作类型，为对应的属性通过反射来赋值

            if (operationType == OperationType.INSERT){

                //为4个公共字段赋值

                try {
                    Method setCreatTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                    Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    setCreatTime.invoke(entity,now);
                    setCreateUser.invoke(entity,currentId);
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }


            }else if(operationType == OperationType.UPDATE) {
                //为两个公共字段赋值
                try {
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    setUpdateTime.invoke(entity, now);
                    setUpdateUser.invoke(entity, currentId);

                } catch (Exception e) {
                    throw new RuntimeException(e);
                }

            }

        }
}
